The Sadeh algorithm was developed by Dr. Avi Sadeh from Tel-Aviv University in Israel and is considered appropriate for younger populations because it was developed using subjects ranging from 10 to 25 years of age. He used the same device that Cole-Kripke used to develop their algorithm, and ActiGraph therefore adapted it in the same way by scaling our data until it matched up with the scoring results of the AMI device. In general terms, this algorithm determines a subject’s sleep state by examining the ActiGraph activity over an 11 minute sliding window. For any given window, a “Sleep Score” (whether the person is asleep or not) can be determined by applying this formula. After selecting a sleep time (Time In Bed (TIB) and Time Out of Bed (TOB)) each minute of sleep data is analyzed this way.